Cita APA (7a ed.)

Christie, A. (1968). The LABORS of Hercules. A Dell Book.

Cita Chicago Style (17a ed.)

Christie, Agatha. The LABORS of Hercules. New York: A Dell Book, 1968.

Cita MLA (9a ed.)

Christie, Agatha. The LABORS of Hercules. A Dell Book, 1968.